OFFSET
0,1
COMMENTS
Additive digital root of a(n) = 4. - Miquel Cerda, Jul 02 2016
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 0..160
Tanya Khovanova, Recursive Sequences
Index entries for linear recurrences with constant coefficients, signature (64).
FORMULA
a(n) = 64*a(n-1), n>0 ; a(0)=4. G.f.: 4/(1-64*x). a(n)=4*A089357(n). - Philippe Deléham, Nov 24 2008
E.g.f.: 4*exp(64*x). - Ilya Gutkovskiy, Jul 02 2016
MAPLE
seq(4^(3*n+1), n=0..13); # Nathaniel Johnston, Jun 26 2011
MATHEMATICA
4^(3*Range[0, 20]+1) (* or *) NestList[64#&, 4, 20] (* Harvey P. Dale, Feb 22 2016 *)
PROG
(Magma) [4^(3*n+1): n in [0..20]]; // Vincenzo Librandi, May 25 2011
(PARI) Vec(4/(1-64*x) + O(x^99)) \\ Altug Alkan, Jul 05 2016
(PARI) a(n)=2^(6*n+2) \\ Charles R Greathouse IV, Jul 11 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved